It really wouldn't be that hard I don't think. After round 35 on black ops 1 and like round 40-45 on black ops 2 its imposible to camp without getting over run, as the zombies HP gets too high to hold them off successfully. (With buried possibly being an exception due to the traps) So after a certain round if you camp for too long you get kicked. Mind you this shouldn't apply if there are less than 5 or so zombies in the map so people can take a break while one person trains the remainder for bathroom break, snack, drink ect.
Why do that when a lot of people likes to do something they think they are not suppose to?
People that "like" to do what they are not supposed to do are called a.....